Hey ,
I am struggling with this issue after upgrading to UE5.1 .
after i drag my blueprint in to editor the editor crashes and this exception will be thrown :
Script Stack (0 frames) :
Assertion failed: *Iter [File:D:\build++UE5\Sync\Engine\Source\Editor\DetailCustomizations\Private\BodyInstanceCustomization.cpp] [Line: 211]
A breakpoint instruction (__debugbreak() statement or a similar call) was executed in UnrealEditor.exe.
to be honest sometime the editor sometime forgets to crash 
i will appreciate your help , thank you.